Notostylops murinus

Overview

Notostylops murinus is an extinct mammal that lived in Eocene Patagonia. A reported skeleton provided clues for examining leg structure. Research continues to explore this animal’s body through limb connections.^[1]

Key facts

What new questions did the report of the first skeleton open? Notostylops offered an opportunity to study how its limbs connected. Attention broadens from individual bones to comparisons of several body parts together.^[1]

Time and place

It is introduced as an Eocene mammal from Patagonia. The Eocene as a whole was roughly 56–34 million years ago. Its skeleton appears in research exploring notostylopids of that time.^[1][2]

The time range describes source context, not the complete duration of this species.

Size, form and skeleton

The reported skeleton allows research on leg structure and bone connections. This animal is treated as a mammal of Notoungulata, a South American ungulate group. Comparing several limb regions together is the starting point for exploring its body.^[1]

A 2022 study estimated the body mass of Notostylops murinus at about 8.5–20kg. The result came from studying size and movement together through limb structures in a nearly complete specimen. Differences preserved in the bones also allow lifestyle comparisons with other early South American ungulates.^[7]

Habitat and reproduction

How did this Eocene mammal support its body? The skeletal report turns limb connections into paleobiological questions. It is a case of exploring body function by reading preserved bones together.^[1]

Fossil discovery

The study of the first skeleton was initially released online in December 2018 and formally published in 2019. It broadened questions from the Notostylops skeleton to the paleobiology of Eocene relatives. A new specimen can change the direction of research on an animal.^[1]

References

1. Study of the first skeleton of Notostylops murinus and its Eocene relatives
2. International Commission on Stratigraphy (2024) — Geological time chart
3. Soria & Bond — New material on the anterior skull of Trigonostylops
4. MacPhee et al.2021 — Cranial morphology and phylogenetic relationships of Trigonostylops wortmani
5. Study of the first skeleton of Notostylops murinus and its Eocene relatives
6. International Commission on Stratigraphy (2024) — Geological time chart
7. Vera et al. (2022) — Locomotion and body size of Notostylops and Notopithecus

Research questions

How does articulated material differ from isolated bones? It allows positions in the body and connecting regions to be considered together. The first skeleton of Notostylops is a case of expanding limb research.^[1]

Observation

Move your gaze from individual leg bones to the regions connecting them. Thinking of body-supporting structures as connected helps you follow the research questions opened by the first skeletal report.^[1]